Indirect water heater



L. R.MENDELS0N INDmuCT WATER HEATER Filed July 2 2, 1921 za y Leiris a. Malmaison",

OF CLEVELAND, OHJEO.

INDIRECT XVATER HEATER.

Application led July 22,

This invention relates to indirect water heaters, such as are used in connection with steam, hot water, or vapour heating plants for the purpose of heating water for household orother uses Theobjects of the invention are to provide an improved device of the kind described which is cheap to manufacture and install, which is highly eticient and which positively separates the two currents of water to be heated and the heating medium therefore without leakage of one to the other or tb the outside of the indirect heater.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

In the drawings, which represent one suitable embodiment of the invention, Fig. 1 is a diagrammatic view illustrating a heating system with the indirect heater installed therein; Fig. 2 is a sectional elevation, on a larger scale, through the indirect heater; and Fig. 3 is a sectional plan View onthe line 3 3, Fig. 2.

In the drawings, 1 represents a Suitable household furnace, which may be either a hot rwater, steam or vapour boiler, but in any case kitchen or at any other suitable place. Said tank has a cold water supply pipe 4 and a service pipe 5 for conducting hot water to the place of use. 6 is the usual gas or oil' heater for heating the water in tank 3, the

water being circulated between tank 3 and heater 6 by pipes 7.

The indirect heater forming the subject matter of this invention is indicated at 10 and is shown in detail in Figs. 2 and 3. lit comprises a hollow casing 11 divided horizontally for convenience in assembly, the two halves each having integral end head and cylindrical'wall portions, the latter being flanged at 12 and held together with a suitable gasket 13 by the bolts 14C. The chamber lhwithin said casing communicates by pipes 16 with the chamber 2 of the furnace so that heating medium, such as hot water, is circulated from the furnace through the'indirect heater. The dow may be shut 1921. Serial No. 486,727.

off by suitable valves 17. Jacket 11 may be made of any suitable cheap material, such as cast iron. l l y Within the chamber 15 are located one or 'more coils 18, one being shown, through which the water from tank 3 is circulated for heating the same. This coil is usually of copper, although any suitable material may be used.'1 At each end said coil has brazed or otherwise secured thereto a fitting l19 which for a short distance continues the spirality of the coil, then extends inwardly to and along the axis of the coil and out through an opening in the casing head. Withinthe casing each fitting is provided with a non-circular portion 2(),.say hexagonal or square, which lies between lugs 21 of the casing to prevent its rotation. Lead gas kets 22 are placed around said fitting inside and outside of the casing, the casing surfaces which receive them being faced ed smooth if necessary. A. lock nut 23 is screwed up on the threaded end of the fitting to secure and seal all joints and the outer end of each fitting. has connected theretov apipe 24 communicating with the water tank 3.

In summer or when the furnace ,1 is not in use the water in tank 3 is heatednwith the heater 6. However, when there is a fire in furnace 1 the heating medium therefrom' is circulated downwardly through the chamber 15 of the indirect heater and heats the rising stream of water in the coil 18, so that the furnace, by heat exchange, heats the water in tank 3.

The indirect heater avoids the use of coils in thefurnace and does away with burning out or rusting such coils and the joints thereto. The heater may be made at low cost -and is easily and cheaply installed. It also *is so arranged as to secure high efficiency and avoids any possibility of leakage. ln assembling the parts, the coil is secured at one end in one half of the casing or jacket, the other half of the casing is then secured in place, and finally the coil is secured to /the second half of the casing.. No harmful tions of said casing having associated therewith one of the end portions of said coil, means for securin the coil in place, and means arran d within said casing and acting indepen ently of said securing means forpreventing relative rotary movement ofsaid coil and said casing.

2. An indirect water heater, comprising a casing, havin side and end wall portions, connections or circulating a heating Inedium through the casing, a coil in said casing through which liquid to be heated may be circulated, each of the two end Wall portions of said casing having associated therewith one of the end portions of said coil, means for securing the coil in place, and means additional to said securing means for preventing relative rotary movement of said coil and said casing while assembling and disassembling said parts.

3. An indirect water heater, comprising a hollow cylindrical casing divided transversely between its lends into two parts, each having integral end head and cylindrical wall portions, means for securing the cylindrical wall portions of the two parts to each other, side connections through the Wall portions for circulating heating medium through the casing, a coil in said casing through which liquid to be heated may be.

circulated, vsaid coil at .each end extending through an end head of the casing, means for securing the coil in place, and additional means for preventing relative rotation between the coil and casing.

4. An indirect water heater, comprising a two partn hollow casing provided -with means for securing the two parts to each other, connections for circulating heating medium through the casing, a coil in said casing through which liquid to be heated may be circulated, said coil within the casing being provided with a non-circular portiommeans on the casing for engaging said portion, a

gasket surrounding the coil and engaging the casing, and a nut for securing the parts together.

5. An indirect water heater, comprising a casing having side and end wall portions, connections for circulating a heating medium through the casing, a coil in said casing through which liquid to be heated may be circulated each of the two end wall portions of said casing having associated therewith one of the end portions of said coil, means for securing the coil in place, and means integral with said coil and said casing end portions for preventing relative rotaryr movement of said coil and said casing.

In testimony whereof I hereby affix my si gnature.

LOUIS R. MENDELSON. 

